/Engine/Plugins/Online/OnlineSubsystemSteam/Source/Public/OnlinePingInterfaceSteam.h
Returns the P2P relay ping information for the current machine. This information can be serialized over the network and used to calculate the ping data between a client and a host.
relay information blob stored as a string for relaying over the network. If an error occurred, the return is an empty string.
[FString](API\Runtime\Core\Containers\FString) GetHostPingData() const